| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * SDK7786 FPGA NMI Support. |
| 4 | * |
| 5 | * Copyright (C) 2010 Paul Mundt |
| 6 | */ |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/string.h> |
| 10 | #include <mach/fpga.h> |
| 11 | |
| 12 | enum { |
| 13 | NMI_MODE_MANUAL, |
| 14 | NMI_MODE_AUX, |
| 15 | NMI_MODE_MASKED, |
| 16 | NMI_MODE_ANY, |
| 17 | NMI_MODE_UNKNOWN, |
| 18 | }; |
| 19 | |
| 20 | /* |
| 21 | * Default to the manual NMI switch. |
| 22 | */ |
| 23 | static unsigned int __initdata nmi_mode = NMI_MODE_ANY; |
| 24 | |
| 25 | static int __init nmi_mode_setup(char *str) |
| 26 | { |
| 27 | if (!str) |
| 28 | return 0; |
| 29 | |
| 30 | if (strcmp(str, "manual") == 0) |
| 31 | nmi_mode = NMI_MODE_MANUAL; |
| 32 | else if (strcmp(str, "aux") == 0) |
| 33 | nmi_mode = NMI_MODE_AUX; |
| 34 | else if (strcmp(str, "masked") == 0) |
| 35 | nmi_mode = NMI_MODE_MASKED; |
| 36 | else if (strcmp(str, "any") == 0) |
| 37 | nmi_mode = NMI_MODE_ANY; |
| 38 | else { |
| 39 | nmi_mode = NMI_MODE_UNKNOWN; |
| 40 | pr_warning("Unknown NMI mode %s\n", str); |
| 41 | } |
| 42 | |
| 43 | printk("Set NMI mode to %d\n", nmi_mode); |
| 44 | return 0; |
| 45 | } |
| 46 | early_param("nmi_mode", nmi_mode_setup); |
| 47 | |
| 48 | void __init sdk7786_nmi_init(void) |
| 49 | { |
| 50 | unsigned int source, mask, tmp; |
| 51 | |
| 52 | switch (nmi_mode) { |
| 53 | case NMI_MODE_MANUAL: |
| 54 | source = NMISR_MAN_NMI; |
| 55 | mask = NMIMR_MAN_NMIM; |
| 56 | break; |
| 57 | case NMI_MODE_AUX: |
| 58 | source = NMISR_AUX_NMI; |
| 59 | mask = NMIMR_AUX_NMIM; |
| 60 | break; |
| 61 | case NMI_MODE_ANY: |
| 62 | source = NMISR_MAN_NMI | NMISR_AUX_NMI; |
| 63 | mask = NMIMR_MAN_NMIM | NMIMR_AUX_NMIM; |
| 64 | break; |
| 65 | case NMI_MODE_MASKED: |
| 66 | case NMI_MODE_UNKNOWN: |
| 67 | default: |
| 68 | source = mask = 0; |
| 69 | break; |
| 70 | } |
| 71 | |
| 72 | /* Set the NMI source */ |
| 73 | tmp = fpga_read_reg(NMISR); |
| 74 | tmp &= ~NMISR_MASK; |
| 75 | tmp |= source; |
| 76 | fpga_write_reg(tmp, NMISR); |
| 77 | |
| 78 | /* And the IRQ masking */ |
| 79 | fpga_write_reg(NMIMR_MASK ^ mask, NMIMR); |
| 80 | } |